Well I just installed FF 3.5 on my Mac and hallelujah she is a speedy browser! I know my biggest complaint with FF3 was it's speed so I am a happy camper. FF 3.5 is also sporting some new features that you can read up on at Mozilla.

I will upgrade my PC at home tonight... I hope the performance increase is just as noticeable there.

Slimsearch (which has been around for years on FF) is like the Accelerators in IE8. I use Slimsearch extensively. If it is not updated soon I'll head over to IE8 a little more often. I prefer to use an updated browser.

Other than the various extension issues, no real problems so far. I would wait a few more days or even a week or two before updating if you have many extensions or themes you like. Perhaps I can see if my extensions will run anyways...